CN105226069A - A kind of double face display panel and double-side display device - Google Patents

Abstract

The invention discloses a double-sided display panel and a double-sided display device, wherein the double-sided display panel includes a plurality of pixel units arranged in an array, the pixel units include front display pixels and back display pixels, and the front display pixels include first thin film transistors , the first cathode, the first anode, and the first light-emitting layer between the first cathode and the first anode; the first anode is electrically connected to the drain of the first thin film transistor; and the reverse display pixel includes the second thin film transistor, the first thin film transistor Two cathodes, a second anode, a second light-emitting layer between the second cathode and the second anode, and a light-reflecting layer; the second anode is electrically connected to the drain of the second thin film transistor, and the light-reflecting layer is arranged on the second cathode away from the second On the side of the light-emitting layer; the drain of the first thin film transistor is used to prevent the light of the first light-emitting layer from exiting the back of the display panel, and the reflective layer is used to prevent the light of the second light-emitting layer from exiting the front of the display panel. The double-sided display panel of the present invention is simple to manufacture and easy to be light and thin.

Description

Double-sided display panel and double-sided display device

technical field

The invention relates to the field of display technology, in particular to a double-sided display panel and a double-sided display device.

Background technique

At present, the display panel is mainly displayed on one side, but in many occasions, such as digital signage, window inquiry facilities, advertising playback facilities in public places such as exhibition halls, there are often two people viewing the display screen from the front and back sides of the display panel at the same time. .

In order to realize double-sided display, if an LCD (Liquid Crystal Display, liquid crystal display) panel is used, no light source can be placed on both sides of the panel, and only ambient light can be used as the light source, and the brightness is very limited. Therefore, at present, two independent LCD panels are generally combined. In order to realize the display, a relatively complicated connection and driving relationship between the two LCD panels is required, which greatly increases the production cost of the display panel, and also increases the thickness of the panel, which does not meet the requirements of the display panel. lightweight design.

Contents of the invention

The invention mainly solves the problems of complex production, large thickness and high cost of the double-sided display panel in the prior art.

In order to solve the above technical problems, the present invention proposes a double-sided display panel, which includes a plurality of pixel units arranged in an array, the pixel units include front display pixels and back display pixels, and the front display pixels include first thin film transistors , a first cathode, a first anode, and a first light-emitting layer disposed between the first cathode and the first anode; wherein the first anode is electrically connected to the drain of the first thin film transistor; the reverse display pixel includes a second thin film transistor, a second cathode, a second anode, a second light-emitting layer and a light-reflecting layer arranged between the second cathode and the second anode; wherein, the second anode is electrically connected to the drain of the second thin film transistor, and the light-reflecting layer is arranged on On the side of the second cathode away from the second light-emitting layer; the drain of the first thin film transistor is used to prevent the light of the first light-emitting layer from exiting from the reverse side of the double-sided display panel, and the light-reflecting layer is used to prevent the light of the second light-emitting layer from exiting. Front-side emission of double-sided display panels.

Wherein, the first cathode and the second cathode are transmission cathodes and are made of silver.

Wherein, the first cathode and the second cathode are located on the same plane and are electrically connected.

Wherein, the first anode and the second anode are transmission anodes and are made of indium tin oxide.

Wherein, the first light emitting layer and the second light emitting layer are organic light emitting diodes.

Wherein, the plurality of pixel units include a red pixel unit, a green pixel unit and a blue pixel unit, and the red pixel unit, the green pixel unit and the blue pixel unit are arranged sequentially in the first direction.

Wherein, the pixels displayed on the front side and the pixels displayed on the back side are arranged sequentially in the first direction.

Wherein, the front side display pixels and the back side display pixels are arranged sequentially in the second direction, and the first direction is perpendicular to the second direction.

Wherein, a pixel division layer is arranged between adjacent front display pixels and rear display pixels.

In order to solve the above technical problems, the present invention also proposes a double-sided display device, which includes the above-mentioned double-sided display panel.

The beneficial effect of the present invention is that, different from the prior art, the double-sided display panel of the present invention includes a plurality of pixel units arranged in an array, the pixel units include front display pixels and reverse display pixels, and the front pixels include first thin film transistors, first The cathode, the first anode, and the first light-emitting layer between the first cathode and the first anode, the first anode is electrically connected to the drain of the first thin film transistor, and the drain of the first thin film transistor is used to prevent the first light-emitting layer from The light emitted from the double-sided display panel is emitted from the reverse side of the double-sided display panel, so the light emitted by the first light-emitting layer is emitted from the front side, and the front-side pixels can realize front-side display; while the reverse-side pixels include the second thin film transistor, the second cathode, the second anode, and the The second light-emitting layer and the light-reflecting layer between the two cathodes and the second anode, the second anode is electrically connected to the drain of the second thin film transistor, and the light-reflecting layer is arranged on the side of the second cathode away from the second light-emitting layer, which can prevent The light of the second light emitting layer is emitted from the front side of the double-sided display panel, and the light emitted by the second light emitting layer is used for displaying on the reverse side. The present invention realizes the display of the front pixel and the reverse pixel through the arrangement of the first light-emitting layer and the second light-emitting layer, and then realizes the double-sided display of the panel. The double-sided display panel with this structure is easy to manufacture and easy to be thinned and thinned.

Description of drawings

FIG. 1 is a schematic structural view of a first embodiment of a double-sided display panel of the present invention;

FIG. 2 is a schematic structural view of the first light-emitting layer in the first embodiment of the double-sided display panel shown in FIG. 1;

FIG. 3 is a schematic diagram of a first array arrangement of multiple pixel units in the first embodiment of the double-sided display panel shown in FIG. 1;

FIG. 4 is a schematic diagram of a second array arrangement of multiple pixel units in the first embodiment of the double-sided display panel shown in FIG. 1;

FIG. 5 is a schematic structural view of the first embodiment of the double-sided display device of the present invention.

detailed description

Referring to FIG. 1, FIG. 1 is a schematic structural view of the first embodiment of the double-sided display panel of the present invention. The double-sided display panel 100 of this embodiment includes a plurality of pixel units arranged in an array, and each pixel unit includes a front display pixel 11 and a rear display pixel 11. Display pixels 12 , wherein the front display pixels 11 realize the front display of the double-sided display panel 100 , and the rear display pixels 12 realize the reverse display of the double-sided display panel 100 .

Specifically, the front display pixel 11 includes a first thin film transistor 111 , a first cathode 112 , a first anode 113 and a first light-emitting layer 114 , wherein the first light-emitting layer 114 is disposed between the first cathode 112 and the first anode 113 between. The first anode 113 is electrically connected to the drain 1111 of the first thin film transistor 111 . And the drain 1111 of the first thin film transistor 111 is used to prevent the light of the first light emitting layer 114 from exiting from the reverse side of the double-sided display panel 100 .

For the working display process of the front display pixel 11, the first cathode 112 is a common voltage, the first anode 113 is electrically connected to the drain 1111 of the first thin film transistor 111, and the first thin film transistor 111 transmits the signal to the first anode 113, so that A potential difference is generated between the first anode 113 and the first cathode 112 to excite the first light-emitting layer 114 to emit light, so that the double-sided display panel 100 can emit light by itself to realize display. In this embodiment, the first light-emitting layer 114 is an OLED (Organic Light-Emitting Diode). Please refer to FIG. 2 for details. FIG. 2 is a schematic structural diagram of the first light-emitting layer in the first embodiment of the double-sided display panel shown in FIG. 1 .

The first light-emitting layer 114 includes an electron injection layer 1141, an electron transport layer 1142, an OLED functional layer 1143, a hole transport layer 1144, and a hole injection layer 1145 that are stacked downward in sequence; the first cathode 112 covers the electron injection layer 1141 side, the first anode 113 covers the lower side of the hole injection layer 1145 . The voltage between the first anode 113 and the first cathode 112 causes holes to be injected into the OLED functional layer by the hole injection layer 1145 and the hole transport layer 1144; while electrons are also injected into the OLED by the electron injection layer 1141 and the electron transport layer 1142 In the functional layer, holes and electrons meet in the OLED functional layer, and the organic material of the OLED functional layer is excited to emit light. What is described above is a PM-OLED, and other types of OLEDs may also be used in other implementation manners.

In this embodiment, the drain electrode 1111 extends to the bottom of the first light-emitting layer 114 to prevent the light of the first light-emitting layer 114 from exiting from the reverse side of the double-sided display panel 100, and the drain electrode 1111 is made of an opaque metal material. , so it is possible to prevent light from exiting, that is, the light emitted by the first light-emitting layer 114 is only used for the front display of the double-sided display panel 100, and if the drain electrode 1111 is made of reflective metal, the light used for the front display includes the first luminescence The light exiting directly from the layer 114, and the light reflected by the drain 1111. The emitted light needs to pass through the first cathode 112 and the first anode 113, so they are transparent electrodes, wherein the first cathode 112 is made of silver Ag, and the first anode 113 is made of indium tin oxide (ITO).

For the reverse display pixel 12, it includes a second thin film transistor 121, a second cathode 122, a second anode 123, a second light-emitting layer 124 and a light-reflecting layer 125, wherein the second light-emitting layer 124 is arranged on the second cathode 122 and the second anode Between 123. The second anode 123 is electrically connected to the drain electrode 1211 of the second thin film transistor 121, and the light-reflecting layer 125 is arranged on the side of the second cathode 122 away from the second light-emitting layer 124, and the light-reflecting layer 125 can prevent the light of the second light-emitting layer 124 The front side of the double-sided display panel 100 emits light.

The display principle of the reverse display pixel 12 is the same as that of the front display pixel 11. Correspondingly, in terms of structure, the second thin film transistor 121 in the reverse display pixel 12 is the same as the first thin film transistor 111; the second cathode 122 and the first cathode 112 are both transparent The cathode is made of Ag; the second anode 123 is the same transparent anode as the first anode 113 and is made of ITO.

Different from the front display pixel 11, the reverse display pixel 12 also includes a reflective layer 125, and the reflective layer 125 is arranged on the side of the second cathode 122 away from the second light emitting layer 124, so it can prevent the second light emitting layer 124 from The light emitted from the front side of the double-sided display panel 100, that is, the light generated by the second light-emitting layer 124 is only emitted from the back side of the double-sided display panel 100 for displaying images on the back side. The reflective layer 125 is made of metal material and covers the second cathode 122. It can not only prevent light from exiting from the front of the double-sided display panel 100, but also reduce the resistance of the second cathode 122. When the impedance is reduced, the corresponding energy The mobility of electrons and the injection efficiency of electrons are improved, and then the voltage uniformity of the second cathode 122 is improved, so as to improve the display effect.

The front display pixels 11 and the reverse display pixels 12 are arranged at adjacent positions on the same substrate, and the first cathode 112 and the second cathode 122 are on the same plane and are electrically connected. In this embodiment, the first cathode 112 and the second cathode 122 are For the two parts on the same common electrode, a layer of common electrode is deposited on the substrate as the first cathode 112 and the second cathode 122 during fabrication.

In order to avoid interference between adjacent pixels, a pixel dividing layer 13 is also provided between the front display pixels 11 and the rear display pixels 12, and is made of insulating and light-proof material.

For the manufacturing process of the double-sided display panel 100 in this embodiment, since the front display pixel 11 and the rear display pixel 12 have roughly the same structure, the thin film transistor layer can be deposited and formed at one time, and etched into a certain pattern to form the first thin film transistor. 111 and the second thin film transistor 121; the anode layer (including the first anode 113 and the second anode 123) and the cathode layer (including the first cathode 112 and the second cathode 122) can also be formed by one deposition, and the last deposition forms a reflective Layer 125; in this embodiment, the manufacturing process is relatively simple, and the corresponding manufacturing cost is relatively low.

In this embodiment, the reason why the cathode layer and the anode layer are set as transparent electrodes, and the reflective layer and the thin film transistor are used to prevent light emission is also the basis for the above-mentioned simplification of the manufacturing process. If the first anode 113 in the front display pixel 11 is directly set to be opaque, while the second anode 123 in the back display pixel 12 is light-transmissive, then two depositions are required when forming the anode layer. Such a process It is more complicated than the single deposition in this embodiment.

Regarding the OLED, it should be noted that in the technical field, it is also considered that the OLED not only includes the first light-emitting layer 114, but also includes the first cathode 112 and the first anode 113, which differ from this application only in the way of description, the specific structure and There is essentially no difference in how it works.

It should also be noted that the front and back sides of the double-sided display panel are defined for the convenience of description, and they are relative concepts. Therefore, the front side and the back side do not constitute a limitation on the double-sided display panel in this application.

In order to realize image display, there are multiple pixel units on the double-sided display panel 100 in this embodiment, including red pixel units, green pixel units and blue pixel units, that is, the pixels in the displayed image are composed of three primary colors of red, green and blue. In other embodiments, the pixel points can also be composed of other color points, such as red, green, blue, and white, and the corresponding plurality of pixel units include red pixel units, green pixel units, blue pixel units, and white pixel units.

However, in this embodiment, each red pixel unit includes a red front display pixel R and a red reverse display pixel r, each green pixel unit includes a green front display pixel G and a green reverse display pixel g, and each blue pixel unit includes a blue pixel unit The blue front side displays pixel B and the blue back side displays pixel b. There are various arrangements, please refer to Figure 3 and Figure 4, Figure 3 is a schematic diagram of the first array arrangement of multiple pixel units in the first embodiment of the double-sided display panel shown in Figure 1, and Figure 4 is a schematic diagram of the first array arrangement shown in Figure 1 A schematic diagram showing a second array arrangement of multiple pixel units in the first embodiment of the double-sided display panel.

In FIG. 3 , red pixel units, green pixel units and blue pixel units are arranged sequentially in the first direction X, and front display pixels and reverse display pixels of each pixel unit are also arranged sequentially in the first direction X. Among them, the red front display pixel R, the green front display pixel G and the blue front display pixel B respectively display red, green and blue to realize the display of pixels in the front display image. In the arrangement shown in FIG. 3, the two There is a reverse display pixel between the front display pixels, and it can be known from the above description of the pixel unit that in the front display image, the reverse display pixels do not emit light. Based on the capabilities of the current manufacturing process, the double-sided display panel has relatively high resolution, so the non-luminous reverse display pixels in the front display image will be ignored when viewed by the human eye, that is, the influence of the reverse display pixels on the front display image quality is not obvious. Similar to the front display, the red reverse display pixel r, the green reverse display pixel g, and the blue reverse display pixel b constitute a pixel in the reverse display image, and in the reverse display image, the front display pixels do not emit light.

In FIG. 4, the red pixel unit, the green pixel unit and the blue pixel unit are arranged sequentially in the first direction X, and the front display pixels and reverse display pixels of each pixel unit are arranged sequentially in the second direction Y, And both the first direction X and the second direction Y are perpendicular. The solution in FIG. 4 is different from the solution in FIG. 3 only in the arrangement, and the others are similar.

Different from the prior art, the double-sided display panel in this embodiment includes a plurality of pixel units arranged in an array. The pixel units include front display pixels and reverse display pixels, and the front pixels include first thin film transistors, first cathodes, and first anodes. and the first light emitting layer between the first cathode and the first anode, the first anode is electrically connected to the drain of the first thin film transistor, and the drain of the first thin film transistor is used to prevent the light of the first light emitting layer from both sides The back side of the display panel is emitted, so the light emitted by the first light-emitting layer is emitted from the front side, and the front side pixels can realize front side display; while the back side pixels include the second thin film transistor, the second cathode, the second anode, the second cathode and the second The second light-emitting layer and the light-reflecting layer between the anodes, the second anode is electrically connected to the drain of the second thin film transistor, and the light-reflecting layer is arranged on the side of the second cathode away from the second light-emitting layer, which can prevent the second light-emitting layer from The light is emitted from the front side of the display panel, and the light emitted by the second light-emitting layer is used for displaying on the back side. In this embodiment, the display of the front pixels and the back pixels is realized through the arrangement of the first luminescent layer and the second luminescent layer, and then the double-sided display of the panel is realized. The double-sided display panel with this structure is easy to manufacture and easy to be thinned and thinned.

The double-sided display panel is used in a double-sided display device for practical application. Please refer to FIG. 5 for details. FIG. 5 is a schematic structural diagram of a first embodiment of a double-sided display device of the present invention. In this embodiment, a double-sided display device 500 includes a double-sided display panel 51 , an optical film 52 and a bracket 53 .

The double-sided display panel 51 is similar to the above-mentioned double-sided display panel 100 , and details are not repeated here. Both sides of the double-sided display panel 51 are provided with optical films 52 for light control and image display. The bracket 53 is used to fix and support the double-sided display panel 51 and the optical film 52 .

Different from the prior art, the double-sided display device in this embodiment uses a double-sided display panel with high display quality, relatively simple manufacture, and easy thinning design, and the corresponding double-sided display device can also be used for mass production at a lower cost. production, and can be used in real life with high display quality and thin and light design.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A double-sided display panel, characterized in that the double-sided display panel includes a plurality of pixel units arranged in an array, and the pixel units include front display pixels and reverse display pixels, The front display pixel includes a first thin film transistor, a first cathode, a first anode, and a first light-emitting layer disposed between the first cathode and the first anode; wherein, the first anode and the first anode The drain of the first thin film transistor is electrically connected; The reverse display pixel includes a second thin film transistor, a second cathode, a second anode, a second light-emitting layer and a light-reflecting layer arranged between the second cathode and the second anode; wherein, the second anode electrically connected to the drain of the second thin film transistor, and the reflective layer is disposed on the side of the second cathode away from the second light-emitting layer; The drain of the first thin film transistor is used to prevent the light of the first light-emitting layer from exiting from the reverse side of the double-sided display panel, and the light-reflecting layer is used to prevent the light of the second light-emitting layer from exiting the double-sided display panel. Front-side emission of the display panel. 2. The double-sided display panel according to claim 1, wherein the first cathode and the second cathode are transmissive cathodes made of silver. 3. The double-sided display panel according to claim 2, wherein the first cathode and the second cathode are located on the same plane and are electrically connected. 4. The double-sided display panel according to claim 1, wherein the first anode and the second anode are transmissive anodes made of indium tin oxide. 5. The double-sided display panel according to claim 1, wherein the first light emitting layer and the second light emitting layer are organic light emitting diodes. 6. The double-sided display panel according to claim 1, wherein the plurality of pixel units comprises a red pixel unit, a green pixel unit and a blue pixel unit, and the red pixel unit, the green pixel unit and the blue pixel unit The pixel units are arranged sequentially in the first direction. 7 . The double-sided display panel according to claim 6 , wherein the front display pixels and the rear display pixels are arranged sequentially in the first direction. 8 . The double-sided display panel according to claim 6 , wherein the front display pixels and the back display pixels are arranged sequentially in a second direction, and the first direction is perpendicular to the second direction. 9 . The double-sided display panel according to claim 6 , wherein a pixel division layer is arranged between the adjacent front display pixels and the back display pixels. 10. A double-sided display device, characterized in that the double-sided display device comprises the double-sided display panel according to any one of claims 1-9.